Brake mechanism for maximum-traction trucks.



J. A. BROOKS.

BRAKE MECHANISM FOR MAXIMUM TRACTION TRUCKS. APPLICATION FILED ocT.26. 1912.

1,138,842. Patented May11,1915.

3 SHEETSSHEET I.

I W who/z,

J. A. BROOKS.

APPLICATION FILED OCT-26, I9I2- Patented May 11, 1915.

3 SHEETS-SHEET 2- awuawlioz THE NORRIS PETERS CO., FHOTU'LITHQ, WASHINGTON, C.

J. A. BROOKS.

BRAKE MECHANISM 'FOR MAXIMUM TRACTION TRUCKS.

3 SHEETS-SHEET 3.

Patented May 11, 1915.

APPLICATION FILED OCT-26.1912.

\ 3 mm M307, $77005 57 0 315 lisittoztua p THE NORRIS PETERS 60.. PHOTO-LITHQ. WASHINGTON. D. C,

UNITED STATES PATENT OFFICE.

JAMES A. BROOKS, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE J. G. BRILL (10., OF PHILADELPHIA, PENNSYLVANIA, A

CORPORATION OF PENNSYLVANIA.

BRAKE MECHANISM FOR MAXIMUM-TRACTION TRUCKS.

Specification of Letters Patent.

Patented May 11, 1915.

Application filed October 26, 1912. Serial No. 727,824.

To all whom it may concern: o Be it known that I, JAMES A. BRooKs, a

citizen of the United States, and a resident of the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Improvement in Brake Mecha-' nisms for 'MaXimum-Traction Trucks, of

which the following is a specification.

The object of my. invention is to provide a brake mechanism, which will be positive and certain in its operation, capable of adjustment and not liableto get out of order. This and other objects are accomplished by my invention, one embodiment of whichis hereinafter set forth.

For a more particulardescription of my invention reference is to be had to the ac companying drawings, forming a part hereof, in wh1ch p 7 1 Figure 1 1s a s de elevatlon of a truck pro- H vided with my improved brake, only parts i of the truck being shown. Fig. 2 is" an end elevation of a brake beam. Fig. 3 shows the brake beam of Fig. 2 mounted in a guide for supporting the same. Fig. 4: is a. plan view of the structure shown in Fig. ,3. Fig.

5 is a plan view of a part of the structure shown in Fig. 1. Fig. 6 is a sectional view taken on the line 66'of Fig. 7 looking in the direction of the arrows: Fig. 7. is a side elevation, somewhat enlarged, of'the brake mechanism. Fig. 8 is a sectional View taken on the line 88 of Fig. 7. Fig. 9 is a perspective view of a bracket for supporting the connecting bar. Fig. 10 is a sectional view taken onthe line 10- 10 of Fig. 7, looking in the direction of the arrows. Fig. 11

is a sectional view showing a connecting bar and brake beam and the mechanism'for supporting and connecting the same. Fig. 12 shows a clevis adaptedeto connect a'lever with a brake beam. Fig. 13 shows abrake beam in cross section and the parts connected therewith.

Throughout the various views of the drawings, similar reference characters desig nate similar parts.

My improved brake mechanism may be applied to any suitable truck 2, but preferthirds chord 4 and transoms 5 to rub against the wheel ably to a maximum traction truck'used to carry heavy ofthe pressure of the brake shoes is applied to the large or driving wheels and one third to the smaller or trailing wheels. The truck has the usual top chord 3, bottom and 6, as well as other parts a few of which are shown.

The brake mechanism is provided with a body pull rod 7' (see Fig. 5) which is adapted to be drawn in the direction of the arrows. This rod 7 is united with a connecting bar 8, inthe conventional manner, and this bar 8 connectsvertical levers 9, the ends of this bar 8 being rounded at 10 for this purpose. The levers 9 are in each instance pivotally mounted in .a clevis 11, which is fixed to a brake beam 12, by bolts loads where substantially twoor s'crewsor any other suitable means. This I or guideway 15, one slide being used at each end of the brake beam. The slide 15 is sup ported from the lower chord 4 by means of bolts 16 or other suitable means. end of. the brake beam 12, and suitably securedlthereto, is a brake shoe. holder 17 At each carrying a brake shoe 18, whichis adapted 19, when the brake is applied.

The bar 8 is supported by means of suit- 7 able brackets 20, one near each end, and each bracket is held in place by means of bolts 21, which secure it to the horizontal web of a transom 6. a I

The lower end of each lever 9 is provided with a connecting rod 22, which is divided at each endand provided Wltl'l'it number of perforations, so that at one end it is adjustably connected to the lever 9 by a pin 23 and at the other end to a vertical lever 24 through apin 2 5. The pins 23 and 25 may be shifted from time to time so as to allow for a new brake shoe or for wear. The lever .24 is also pivotally connected to a brake shoe holder 26 by means of a suitable pin 27 and this brake shoe holder 26 carries a brake shoe 27 which is adapted to bear against a driving wheel 28 of the conventional type. The brake shoe holder 26 is also provided with suitable sockets which engage the ball ends 29 of suitable hangers 30, which have corresponding ends entering suitable sockets in a bracket 31 fixed to a top chord 3. At their upper ends these hangers are secured by a bolt 30 or other suitable means. The description above given, beginning with the connecting rod 22 applies to both sides of the truck, as this part of the mechanism is duplicated, so that only one brake beam is required and that is the brake beam 12 above referred to. 2 is pivotally connected to a suitable rod, 32 by means of a pin 33 and at its other end, this rod 32, is provided with a pin the transom 6.. The rod 32 is preferably bifurcated at each end just as is the rod 22 and at the end near the pin 34Lit is provided with a plurality of perforations, so as to provide for adjustment to compensate for wear. The bracket 35 is held in place by means of suitable bolts 36, or in anyfother desired way.

If desired, the hangers30 may have their ball ends kept in their respective sockets with some freedom of movement by having the bolts 27 and30 provided with suitable springs 37. I

In view of the foregoing, my improved brake will be readily under stood. 1

Assuming the parts power applied to the rod 7 in the direction of the arrows in Fig. 5, then the-bar S is shifted to the right thereby throwing the 9 in the same direc.

upperends of the levers tion about .the pins in the clevis 11 as fulerums, thereby forcing the brake shoes 18 against their respective wheels and atthe same time the lower ends ofthe levers 9 are thrown to the left, thereby forcing the lower ends of the levers 24 to the left and causing the brake shoes 27 to be applied to the wheels 28. Nhen tension is withdrawn from the bar 7 the shoes withdraw from the wheels and cease to retard their progress.

While I have described one embodiment of my invention, it is obvious that it is not restricted thereto, but that it. is broad enough to cover all structures which come within the'scope of the annexed claims.

Having thus describedmy invention,what I claim is i 1. In a device o the class described, a

7 pair of brake shoes at each side of the truck,

one of said brake shoes being slidably mounted and the other mounted so as to have. a swinging movement, a brake beam said holders,

The upper end of each lever 34, which also en a es a sultable bracket 35 fixed to the operation of to be as shown and uniting two of said shoes and means for applying greater pressure to the driving wheels than. to the trailing wheels.

2. In a device of the class described, a pair of upright levers and a bar connecting the same, a brake beam and means for connecting the same to said levers, brake shoe holders secured to said beam, brake shoes on a second set of vertical levers, connecting rods connecting said two sets of levers, brake shoe holders connected to said second set of levers, said brake shoe holders, brackets and means for supporting the same, and connecting rods, connecting the upper 0nd set of vertical levers with said brackets.

3. In a device of the class described, a bar and slides for supporting the same, upright levers pivotally connected to said bar, a clevis pivotally connected to each o said upright levers, a brake beam uniting the clevises, a brake shoe holder carried by said brake beam, a brake shoe carried by said brake shoe holder, a guide for supporting said brake beam, means for supporting said guide, connecting rods pivotally connected to the lower ends of said upright levers, a second set of'vertical levers and means for a brake shoe holder said rods, pivotally connected; to said second set of levers and abrake shoe carried by this holder, means for supporting said last mentioned brake shoe holder and means for pivoting the upper ends of said last mentioned levers, so that when power is applied to the bar connecting the first mentioned upright levers, the brake shoes are forced against their respective wheels.

,4. In a device of the class described, a sliding brake shoe in cooperation with the trailing wheel, a swinging brake shoe for cooperation with the driving wheel, devices for holding and operating said brake shoes and means connecting said devices.

5. In a device of the class described, a sliding brake shoe in cooperation with the trailing ,wheel, a swinging brake shoe for cooperation with the driving. wheel, de-. vices for holding and operating said brake shoes and adjustable means connecting said devices. Y

6. In a deviceo'f the class described, driving wheels, trailing wheels, a sliding brake shoe supported from a lower element of the truck framefor cooperation with the trailingwheel, a swinging brake shoe pivotally hung from an upper element on the truck frame for cooperation with the driving wheels, and means connecting said shoes.

7 In a device of the class described, driving wheels, trailing wheels, a sliding brake shoe supported from a lower element of the truck framefor cooperation with the trailends of said sec-- 2 means for supporting ing wheel, a swinging brake shoe pivotally hung from an upper element on the truck frame for cooperation with the driving wheels, and adjustable means Connecting said shoes.

8. In a device of the class described, a truck frame, a pair of brake shoes at each side thereof, one swingingly supported and the other slidably mounted, a brake beam uniting two of said shoes and means for causing the brake shoes at each side of the truck to be simultaneously applied to the wheels upon which these respective shoes bear.

9. In a device of the class described, a truck frame, a pair of brake shoes at each side of the truck, one pivotally hung from' an upper member of the truck frame, and the other slidably supported from a lower member of the truck frame and means connecting each pair of shoes to cause them to be simultaneously applied to their respective wheels.

10. In a device of the class described, a truck frame, a pair of brake shoes at each side of the truck, one pivotally hung from an upper member o the truck frame, and the other slidably supported from a lower member of the truck frame, a single brake beam, a guide therefor and connections between said brake beam and the sliding shoes.

11. In a device of the class described, a truck frame, a pair of brake shoes at each side of the truck, one pivotally hung from an upper member of the truck frame, and the other slidably supported from a lower member of the truck frame, a single brake beam, a guide therefor and adjustable connections between the sliding and swinging brake shoes.

12. In a device of the class described, a

truck frame, a pair of brake shoes at each side of the truck, one pivotally hung from an upper .member of the truck frame, and the other slidably supported from a lower 7 member of the truck frame, a single brake beam, a guide therefor and connections between said brake beam and the sliding shoes, the suspension means for the swinging brake shoes having ball and socket supports.

13. In a device of the-class described, a

truck frame, a pair of brake shoes at each side of the truck, one being swingingly supported and the other slidably mounted, a

brake beam connecting the slidably mounted shoes, vertical levers connected with said brake beam and connections between said vertical levers and the swinging brake shoes.

14-. In a device of the class described, a

truck frame, a pair of brake shoes at each I side of the truck, one being swingingly supported and the other slidably mounted, a brake beam connecting the slidably mounted shoes, vertical levers connected with said brake beam, connections between said vertical'levers and the swmgmg'brake shoes tions.

15. In a device of the class described, a

truck frame having a bottom chord at each side, a pair of guides, one guide being supported from each chord, levers connected to said guides, a transom supported by said truck frame, a pair of brackets carried by said transom and means connecting said levers and supported by said brackets.

16. In a device of the class described, a

and means foradjustment of said connecl truck frame, a pair of oppositely disposed brackets, a brake beam slidably mounted in' frame, a brake beam carrying brake shoes pivotally connected to said levers and movably engaging said grooved brackets, links attached to the lower ends of said levers, mechanism for limiting the movement of said links and means for operating the brake shoes.

18. In a device of the class described, a brake beam having a U shaped piece of metal secured thereto at each end, and brackets in which said U pieces slide.

19. In a device of the class described, a truck frame having top and bottom chords, a pair of brake shoes at one side of the truck, one of said shoes being'supported from said top chord and the other from said bottom chord by mechanism connecting said shoes with their respective chords, and means for causing said shoes to be applied simultaneously to their respective wheels.

20. In a device of the class described, atruck frame having top andbottom chords,

bottom chord by mechanism connecting said shoes with their respective chords, mechanism for causing said shoes to be applied simultaneously to their respective wheels, and a brake actuating means connected to one of said shoes.

21. In a device of the class described,- a truck frame having top and bottom chords, a pair of brake shoes at one side of the truck, one of said shoes being supported from said .top chord and the other from said bottom Signed at the city of Phila-delphia, county of Philadelphia, and State of Pennsylvania,

this 24th day of October, 1912. v

' JAMES ABROOKS.

chord by mechanism connecting said shoes to their respective chords, means for applying one of said shoes to its respective Wheel, a brake beam connected to another of said shoes, and means for actuating said brake beam whereby the shoe attached to said beam is applied to a Wheel.

, Witnesses:

HENRY G. EsLrNe, H. F. MGKILLIP.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

- Washington, D. G. 

